Battery draining problem

[Ballerxl]

Heys guys got another problem here, 2011 Peterbilt 367 isx15 2250 540122 miles and deleted... these past few weeks my battery has been draining if I don’t drive it everyday.. issue is when I finish my work day I turn my truck off and my dash lights and gauges stay on.. everything else is off but the dash lights.. I looked for fuses and nothing all is good ..I took off the key switch panel and I found two wires one going to the ground and one going to the Acc connection on the switch .. the Acc was burnt and the ground was completed off the connector.. but the key switch still works! I connected them both back on and the dash lights still stay on after I turn the truck off.. so idk what else to do... all this started happening when I would start to wash my truck thru a truck wash so idk I’m scratching my head.. can anyone help?